Hi,Voluma is not a commodity that is used the same in all patients. There are patients who have minimal volume loss who may need a small amount one time over a two year period. There are other patients who need a large amount of volume replacement. Those patients are treated initially and asked to return to our office about 2 to 3 weeks after their treatment and may have a little more if needed. The US studies have shown that Voluma lasts up to two years, based on an average of 5 to 6 syringes per patient. We have just completed the Dr. de Maio Masters Course of Voluma Injections that emphasized the best strategic areas of the face for getting the best, longest lasting Voluma results while using a minimum of the product, saving patients potentially thousands of dollars. Most importantly, choose your injecting physician most carefully based on their artistic vision, experience, and technical skill. Good luck and be well.Dr. P